3. Electronic Theses and Dissertations (ETDs) - All submissions
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Item Grade 11 learners' and teachers' conceptions of scientific inquiry in relation to instructional practices.(2013-09-30) Dudu, Washington TakawiraThis exploratory, descriptive and interpretive study investigated the interactions among learners’ conceptions of the nature of scientific inquiry (NOSI), teachers’ conceptions of NOSI and teacher instructional practices when teaching investigations in Physical Science. The participants were South Africa, Grade 11 learners (n= 167) and teachers (n=5), from five schools in the Johannesburg region of South Africa. The schools were conveniently and purposefully sampled. Learners’ and teachers’ conceptions on six NOSI tenets were investigated. These tenets are: difference between laws and theories; difference between observation and interpretation; there is no one method in science; accurate record keeping, peer review and replicability in science; socially and culturally embeddedness nature of scientific knowledge; and the role of human creativity and imagination in the development of scientific knowledge. Data on learners’ and teachers’ conceptions of the NOSI was obtained through; questionnaires, probes and interviews. Teacher instructional practices were determined using laboratory class observations, questionnaires, teacher and learner interviews, and analysis of instructional materials. The data was quantitatively analyzed using mainly, descriptive statistics, correlations, Regression Analysis and Multivariate Analysis of Variance (MANOVA). Qualitative data was analyzed using a combination of analytic induction and interpretive analysis. The results show that learners’ NOSI conceptions were inconsistent, fragmented and fluid, with the majority of the learners displaying naïve conceptions. Teachers were found to hold mixed NOSI conceptions ranging from static, empiricist-aligned to dynamic, constructivist-oriented. Teacher instructional practices were found to be a repertoire of contrasting methodological approaches lying along a continuum ranging from close-ended inquiry to open-ended inquiry. The study found the interactions between and among the investigated variables to be weak and not direct and simple, but complex and under the governance of a variety of factors in the instructional milieu. Curriculum and assessment demands were found to be major factors possibly responsible for weakening the interactions. For the investigated variables, it is posited that the interaction between variables is under the governance of both the context in which the instruction takes place and some factors already embedded in the teacher’s or learner’s conceptual ecology. Recommendations and implications for the practice of science education and future research are raised and discussed.Item Educators' experiences of school violence.(2011-03-23) Pahad, ShenaazThe purpose of this study is to explore South African educators’ subjective experiences of school violence within their schools. Educators’ experiences as victims and perpetrators of school violence were examined to gain an understanding of the definitions, contributing factors, impacts and incidents of school violence. An interpretive qualitative research method was used and interviews were conducted with 12 educators selected from two government schools in the low-income community of Alexandra. Participants’ data was then analysed using a thematic content analysis. The findings suggest that current definitions of school violence are too narrow and require expansion so as to include all acts of school violence, victim-perpetrator relationships beyond the confines of the school. Violence in schools was found to increase educators’ dysfunctional coping mechanisms, absenteeism, attrition, burnout and to compromise teaching efficacy and the performance of school. Using Brofenbrenner’s Ecological Approach the principal conclusion of this study was that school violence is a result of the interplay between individual, familial, school, communal and societal factors.Item Learners' conceptions about astronomical concepts related to the sun and the earth(2006-11-16T10:18:48Z) Mosoloane, RetselisitsoeThis research report is based on a study that investigated South African Grade-10 learners’ conceptions about day and night, and the seasons, after instruction in these topics. The study was motivated by examiners’ reports that learners perform poorly in physical science, and by alternative conceptions that learners have about scientific concepts, as reported in the literature. A motive for conducting the study in South Africa is that relatively little has been published about South African learners’ conceptions about day and night, and the seasons. An open-ended diagnostic questionnaire was used to probe learners’ conceptions about day and night, and the seasons. The validity and reliability of the questionnaire were checked by the researchers’ supervisor and colleagues. The questionnaire was piloted in a secondary school in the same township as the school that was later used to collect the main study data. Learners in the pilot study were asked to state problems encountered while answering the questionnaire. This resulted in minor modifications on the questionnaire. The modified questionnaire was then administered to the main study group, and open coding was used to analyze the results. The results show that the majority of learners lacked scientifically acceptable conceptions about day and night, and the seasons, e.g. they did not understand the combined rotation of the Earth about its axis, and the revolution of the Earth about the Sun. The results also show that learners could not properly interpret diagrams, and to effectively use diagrams to clarify their answers. Learners lack scientifically acceptable conceptions despite detailed explanations given in their textbooks, which imply that the books were not used effectively in the learning process. Some recommendations made, following these results, are that learners’ attention should be drawn to rich information presented in their textbooks, and that some 3-dimensional objects should be used when teaching the topic.Item Grade 10 Physical Science Learners’ Understanding and Application of Concepts of Evidence in Experimental Design(2006-11-14T11:46:14Z) Collen, Mkhomazi KhanghelaOne of the most important challenges of the secondary school science teacher is to help learners to obtain, analyze and evaluate evidence using experimental and investigative methods. The understanding and application of concepts of evidence play a central role in setting up valid experiment and is usually ignored in the secondary school science curriculum. Recognizing the significance and value of an understanding of evidence in developing learners’ ability to carry out appropriate experimental work in science, the question arises of learners’ understanding of ‘concepts of evidence’ in experimental design. In this study the researcher endeavored to answer some of the questions concerning learners’ understanding of evidence: What understanding do learners entering the Further Education and Training (FET) band have of the concepts of validity in experimental design? What is the effect of an intervention on their understanding of concepts of validity? How well do learners show their ability to apply concepts of evidence to an assessment task? The study investigated the ability of a sample of grade 10 Physical Science learners, in one Gauteng Province secondary school to use and understand the concepts of evidence before and after an intervention, and their ability apply these ideas about evidence in an assessment sheet task. First, a survey of learners’ understanding of the concepts of validity was conducted using a written diagnostic test, consisting of three probes that had been previously used to diagnose learners’ understanding of validity in experimental design. Second, an evaluation of changes in such understanding due to a specific teaching intervention was completed using the same diagnostic test. Finally, the 2004 Grade 9 Common Tasks for Assessment (CTA) investigation task was administered to the same subjects in order to investigate whether or not their understanding of concepts of evidence would be apparent in this CTA investigation task. Several key findings emerged from the data. The major findings of this study were that the sample investigated began the study with a level of understanding equal to a group of Foundation University students tested in a previous study and that their understanding did not change much during the intervention. In fact, analysis of the results from the probes in the diagnostic test revealed that learners had little problem choosing the independent variable and controlling variables. However, the findings from the probes indicated that the intervention did not seem to have had a major effect since the difference in the number of responses between the pre-test and post- test was relatively small. Moreover, the results also revealed that it was possible to analyze learners’ responses using the existing model of learners’ understanding of validity, and that the majority of learners fell into Level C in the model which refers to the application of previous understanding in a new situation. The results from the CTA investigation task revealed that learners’ understanding of concepts of evidence could be demonstrated in new science context. In fact, the results revealed that learners showed ability to apply their understanding of concepts of evidence in experimental design to the assessment task. Moreover, the CTA results indicated that the understanding of identifying variables, constructing graphs; describing the relationship between variables in a graph; formulating the investigative questions were the most applied concepts of evidence by learners. Finally, the results of this study highlight the need for providing secondary science learners with opportunities to practice and develop concepts of evidence. In the light of these findings it is recommended that children need to be explicitly taught about the purpose of science investigations and introduced to important ideas about evidence if their ability to perform investigation tasks is to be improved.